NaNO2 is used as a preservative for hot dogs and bologna. In acidic solution, ni

Question

NaNO2 is used as a preservative for hot dogs and bologna. In acidic solution, nitrite ion is converted to nitrous acid, HNO2, which reacts with permanganate ion according to the equation: H+(aq) + 5HNO2 (aq) +2MnO4- (aq) ? 5NO3- (aq) +2Mn+2(aq) + 3H2O (l).

A 1.000 g simple of a water-soluble solid containing NaNO2was dissolved in dilute H2SO4 and titrated with 0.01000 M KMnO4 solution. The titration required 12.15 mL of KMnO4 solution. What was the (w/w %) of NaNO2 in the original 1.000 g sample?

Explanation / Answer

mL KMnO4 x Molarity of KMnO4 = millimoles of KMnO4
millimoles of NaNO2 = millimoles of KMnO4 x (2/5)
Molar mass of NaNO2 = 68.995 g/mole
1 milimole KMnO4 = (2/5) x 0.01000 grams NaNO2
1 millimole KMnO4 = 0.004 grams NaNO2

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